Implantation bleeding? Omg am I prego?

If you have had unprotected this most certainly can be implantation bleeding. I will note though that noticeable pregnancy symptoms do not start until about 6 weeks in so you queasiness and fatigue are probably due to something else. It is also a bit late for ovulation but sometimes ovulation can cause slight bleeding, so there is a small possibility it could also be that. I wish you luck but if you miss your period, I'd definitely take a pregnancy test.